setjmp

NAME

       setjmp - save stack context for non-local goto

SYNOPSIS

       #include <setjmp.h>

       int setjmp(jmp_buf env );

DESCRIPTION

       setjmp  and  longjmp(3) are useful for dealing with errors
       and interrupts encountered in a low-level subroutine of  a
       program.   setjmp() saves the stack context/environment in
       env for later use by longjmp().  The stack context will be
       invalidated if the function which called setjmp() returns.

RETURN VALUE

       It returns the value 0 if returning directly and  non-zero
       when returning from longjmp() using the saved context.

CONFORMING TO

       POSIX

NOTES

       POSIX does not specify if the signal context will be saved
       or  not.   If  you  want  to  save   signal   masks,   use
       sigsetjmp(3).   setjmp() makes programs hard to understand
       and maintain.  If possible an alternative should be  used.

SEE ALSO

       longjmp(3), sigsetjmp(2), siglongjmp(2)